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11. Assertion: Nitrogenis a non-
metal.
Reason: Nitrogen has 5 valence electrons.
12. Assertion: Copper does not reacts with the H2SO4.
Reason: Copper is more reactive than hydrogen
13. Assertion: B(5) belongs to group 13 and silicon belongs to group 14
Reason: B.203 is acidic oxide where SiO2 is amphoteric oxide.
14. Assertion: Ammonium hydroxide is Weak Base
Reason: Phenolphthalein becomes pink in NH2OH
15. Assertion: Bleaching powder liberate chlorine when kept in atmosphere
Reason: CaoCl2 reacts with CO2 present in atmosphere to form Caco: and chlorine gas.
16. Assertion: Silver becomes black in colour when exposed to atmosphere.
Reason: Silver reacts with H2S gas to form Ags which is black in colour
17. Assertion: Highly reactive metals are obtained by electrolytic reduction of their molten ore.
Reason: Highly reactive metals can be extracted by chemical reduction.
18. Assertion: Fluorine is more reactive than chlorine.
Reason: Fluorine and chlorine belong to Group 17 called Halogen
19. Assertion: Copper sulphate is acidic salt
Reason: It is a salt of weak base [Cu(OH17] and strong acid (H.S04)
Answers
Answered by
1
Answer:
anong11,12,13,14,15,16,17,18,19
in
11
12
13
16
18
both assertion and reason are correct
in
15,19
assertion is correct but not reason is correct
I don't known the 14and17 questions
Answered by
1
Answer:
11
Nitrogen is the chemical element with the symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.
Reason: Nitrogen has 5 valence electrons.
Explanation:
11 12 13 16 18 both assertion and reason are correct in
15,19
assertion is correct but not reason is correct
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